XRT/XRA-Prozess Schwefelmessinstrument

Messungen des Gesamtschwefelgehaltes (0.02% bis 6% S) in Erd- und Rohöl

NEX XT

Das NEX XT von Rigaku ist das Messinstrument der nächsten Generation für anspruchsvolle Messungen des Gesamtschwefelgehaltes (0.02% bis 6% Schwefel) in Rohöl, Marinedieselöl, Schweröl und anderen hochviskosen Kohlenwasserstoffverbindungen, inklusive Rückständen.

Direkte Messungen des Gesamtschwefelgehaltes

Dieses vielfältige, kompakte und robuste Röntgentransmissions/-absorptions-Prozessmessinstrument wurde speziell für Messungen des Gesamtschwefelgehaltes in Raffinerien, Pipelines, bei Mischprozessen, in Anlegestellen von Ölfrachtern und anderen Öllagerstätten optimiert. Anwendung findet das NEX XT insbesondere bei Marinedieselöl-Mischprozessen gemäß MARPOL Annex VI Schwefelbegrenzungsverordnung, beim Übergang von Treibstoffqualitätsstufen in Pipelines, bei Raffinerie-Ausgangsstoffmischprozessen und -kontrollen sowie bei Qualitätskontrollen von Rohöl-Tiefbohrungen und in Lagerstätten.

Röntgentransmission/-absorption (XRT / XRA)

Die Röntgentransmissionsmessung (XRT) ist ein seit langem akzeptiertes Verfahren zur Messung des Gesamtschwefelgehaltes in der Verabeitung von schweren Kohlenwasserstoffen. Ganz egal ob für Pipelines, Rohöl-Mischungen oder zur Bestimmung / Mischung von Marinedieselöl, das NEX XT XRT Prozessanalysegerät von Rigaku kann stets, auch bei widrigen Bedingungen mit Temperaturen von bis zu 200°C und mit Druckbedingungen von bis zu 1480 psi beim Verarbeiten dieser Materialien, Anwendung finden. Röntgentransmissionsmessungen basieren auf der schwefelspezifischen Abschwächung eines monochromatischen Röntgenstrahls einer bestimmten Energie (21 keV). In der Praxis wird die Absorption von Röntgenstrahlen durch Schwefel in der Kohlenwasserstoffmischung zwischen einer Röntgenquelle und dem Detektor gemessen. Die ermittelte Röntgeninstensität ist umgekehrt proportional zur Schwefelkonzentration. Genauer gesagt bedingt eine hohe Schwefelkonzentration eine geringere Röntgenintensität am Detektor.

NEX XT
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Features

  • Compact design with no routine maintenance
  • Up to 1480 psig and 200°C
  • User adjustable data update frequency
  • Reduced standards requirements
  • No sample condition or recovery system
  • No radioisotopes

NEX XT specifications

Sulfur Analysis Range
  • 0.02 - 6%

Process Conditions

  • Stream pressures to 100 bar (1480 psig)
  • Stream temperatures to 200ºC (392ºF)
  • Flow rates up to 200 l/m (53 gal/m)

Ambient Conditions

  • 0 - 43ºC (32 - 110ºF)

Communications

  • Sulfur results: 4 - 20 mA output
  • Density results: 4 - 20 mA output
  • General warning: dry contact
  • General alarm: dry contact
  • PROFINET or MODBUS 485

Required Inputs

  • 4 - 20 mA raw density
    • precision of ±0.0001 or better

Optional Inputs

  • 4 - 20 mA process temperature
    • for density corrected to 15ºC / 59ºF
  • 4 - 20 mA water concentration
    • if water correction is desired
  • 4 - 20 mA flow
    • for loss of flow warning
  • 4 - 20 mA remote calibration selection
Process Connection
  • Two 1 inch 600 # ANSI flanges

Area Classifications

  • Class 1 Div 1
  • Class 1 Div 2
  • ATEX zone 1 (pending)
  • ATEX zone 2

Air Supply

  • Purge
    • 4.1 - 8.3 bar (60 - 120 psig) air pressure
    • 115 - 225 l/m (4 - 8 scfm) rapid exchange
  • Leakage compensation (application specific)
    • 710 - 990 l/m (25 - 35 scfm) dry oil free air
    • 6.9 - 8.3 bar (100 - 120 psig) air pressure

Power Requirements

  • 115/230 Volts 2.8/1.4 Amps 47 - 63 Hz
    • Dedicated supply
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NEX XT

NEX XT applications

Pipelines, Upgrading Facilities and Refineries

This versatile, compact and robust X-Ray Transmission (XRT) process gauge was specifically optimized for the total sulfur analysis needs of refineries, pipelines, blending operations, heavy oil upgrading, bunkering terminals and other storage facilities.

Applications include bunker fuel blending to meet MARPOL Annex VI sulfur restrictions, interface detection of different grade fuels delivered via pipelines, refinery feedstock blending and monitoring, and the quality monitoring of crude at remote collection and storage facilities.

MARPOL Regulations

IMO ship pollution rules are contained in the "International Convention on the Prevention of Pollution from Ships", known as MARPOL 73/78. On 27 September 1997, the MARPOL Convention was amended by the "1997 Protocol," which includes Annex VI titled "Regulations for the Prevention of Air Pollution from Ships". MARPOL Annex VI sets limits on NOx and SOx emissions from ship exhausts and prohibits deliberate emissions of ozone depleting substances. The Rigaku NEX XT is the perfect tool to assay marine bunker fuels for blending to meet emissions regulation compliance.

3rd Generation Technology

The new Rigaku NEX XT system is faster, more sensitive and far more compact than competitive systems and provides continuous, reliable detection of sulfur at pressures up to 1480 psig and 200ºC. Rigaku NEX XT can operate as a stand-alone analyzer or provide real time closed loop control when tied into a blending or plant wide automation system.

Among its other key features are a simplified user interface, reduced standards requirement, automatic density compensation, automatic water compensation, password protection, and standard platform for communicating sulfur, density, and water content to a plant-wide DCS. Due to its unique design and robust construction, sample conditioning and recovery systems are typically not required.

On-line sulfur in heavy oils

On-line, real time X-ray Transmission (XRT) measurment of sulfur (S) in heavy or light oils to satisfy the needs of refineries, pipelines, blending operations, bunkering terminals and other storage facilities. Applications include bunker fuel blending to meet MARPOL Annex VI sulfur restrictions, interface detection of different grade fuels delivered via pipelines, refinery feedstock blending and monitoring, diesel/kerosene blending or production, and the quality monitoring of crude at remote collection and storage facilities.

Background

While in-line sulfur gauging, for blending, switching and QC, has been around for years, older technologies never delivered on their promise because those systems did not produce consistent measurements. For the accurate on-line determination of sulphur, the new Rigaku NEX XT resolves those past issues and is thus the perfect tool for blending operations supplying marine bunker fuels and crude feedstock for refineries. With uniquely engineered hardware and novel proprietary software technologies, the new Rigaku NEX XT system is faster, more sensitive and far more compact than previous generation systems and provides continuous, reliable detection of sulfur from 200 parts-per-million (ppm) to 6.0 wt. %, with analysis times as short as 1 second. The Rigaku NEX XT can operate as a stand-alone analyzer or provide real time closed loop control when tied into a blending or plant wide automation system.

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